(FILES)Republican presidential candidate Newt Gingrich addresses supporters during an election night rally in this March 6, 2012 file photo in Atlanta, Georgia. Newt Gingrich has decided to quit the US presidential race and will announce next May 1, 2012 that he is no longer seeking the Republican nomination, sources quoted by US media said on April 25, 2012. The former speaker of the House of Representatives will "more than likely," endorse presumptive Republican nominee Mitt Romney as he announces either the suspension or the end of his own campaign, a source told Fox News. AFP PHOTO / Brendan SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)